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Yes, this world did come from pretty much nothing. It was all compressed into pretty much nothing before the Big Bang.
....Matter can't be destroyed or created but just modified.....
Well, the Big Bang was a singularity of sorts, if not in space then certainly in time.
"Space" had no meaning at that moment. Let's say a way to understand it is that there were no dimensions. Length, width, height had no meaning.
In scientific phrases, that's not INCONSISTANT with your comment, if it is revised to the correct form, including both matter and energy thusly...
E=MC^2
PS: I shouldn't have cut you that much slack, sitting her watching a b grade movie about aliens taking over and humans fighting, and giving you about 1% of my attention. You are just plain wrong.
It's energy that's never created or destroyed. Not matter. The proof is in the equation. But it could run considerably deeper than that, and energy may not be conserved.
But what's all that to a good Christian?